Hello, thank you for reaching out to Microsoft Q&A.
Is your PC currently running Windows 11 Home in Safe Mode?
What is the exact error message you receive when you try to install Microsoft Store apps or other applications on your device? Could you please share a screenshot of the error, if possible?
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Please share a few more details about the error message you are receiving on your system. This information will help us better understand the issue and assist you more effectively.